ieoFontMagic 

ieoFontMagic is just a little amazing addon that doesn't mess with your UI too much, though makes it a lot easier to read. Personally i came to conclusion that using default font for WoW is a bad thing to do with high UIScale (0.64). IMO the best font for that high UIScale is Prototype. But then blizzard scrolling combat text picks it up also and IMO it just looks huge and clunky as damage font. So i came to solution by making this little amazing add-on that just changes damage font and that of the scrolling combat text (like "Entering combat" and such). You can pretty much just check the screen shot =)).

You can use different font if you like by replacing the file font.ttf in the add-on folder.

Its very lightweight actually and uses like 1Kb of memory or even less =P